This is a very nice and feature rich beta release.
Append to end of line is very cool. It's fun just to play around with. Like talking in a very echo-y room. If only you could make it so that each line wrote a unique line of code rather than duplicate lines, I could be the world's fastest programmer.
Also the file chooser is excellent, love the quicksilver like functionality. Might be nice to have a folder reference for files with same names, e.g: index.php.
The Bundle editor seems very handy too, but I've yet to dive into it very far.
At any rate, thanks for the new beta. TextMate is making my work a lot more fun.
-Ben